e making ot a
PENNVERNON Window Glass is becoming ever more widely recognized as a sheet glass
of unusually high quality. The rapidly increasing use of Pennvernon throughout the
country proves it. # We have been asked again and again, "Why is Pennvernon Window
Glass superior to ordinary window glass? What is the explanation of its higher quality?"
These questions may be answered in two words: Pennvernon Craftsmanship. % A high
type of American worker who is intensely interested in and proud of his work ... the latest,
most modern production methods and machinery . . . continuous research and develop-
ment of even better manufacturing devices and formulae ... all these factors enter into
the creation and maintenance of the Pennvernon Craftsmanship which makes Pennvernon
a better window glass. # If you could take a trip through a Pennvernon manufacturing
plant . . . watch the Pennvernon Craftsmen as they do their work skilfully and painstakingly
. - . view personally the processes of melting, drawing, cutting, washing, inspecting,
labeling, papering, packing and shipping . . . you would come to a thorough under-
standing of this craftsmanship. # But since such a personal visit is in most cases impossible,
we offer you this booklet as the next best thing. It takes you through a Pennvernon plant
by means of dramatic and interesting photographs . . . describes the processes illustrated
. . . and will, we are confident, incline you to agree with us that the elements of Pennvernon
Craftsmanship depicted here can inevitably have but one result: the Making of a Leader.
PITTS B U KG H
PLATE GLASS COMPANY
The first step in the process that makes
Permvernon a leader. Here the ingredi-
ents of the "batch" mixture are being
accurately weighed to assure uniform
results. The proportions of sand, lime,
soda, etc., are carefully controlled, ac-
cording to a special formula . . . and are
accurate in weight to a few ounces in
many tons. Incidentally, these ingredi-
ents are of the best, costing considerably
more than those which would be neces-
sary to make just ordinary window glass.
The large quantities of ingredients used
in making Pennvernon Window Glass,
must be added to the "batch" mixture in
exact proportions . . . and this automatic
weighing machine, supervised by a skil-
ful Pennvernon Craftsman, helps to in-
sure accuracy of measurement.
Huge hoppers, suspended on overhead
tracks, carry the mixed ingredients to
the melting tanks. Here, the hoppers
have given up their load, and this Penn-
vernon Craftsman is feeding the "batch"
to the furnace. Each Pennvernon melt-
ing tank receives approximately 100
tons a day of raw materials to reduce to
molten "metal". In the process of melt-
ing, 1,250,000 cu. ft. of gas are burned
per day in each tank, and temperatures
inside the tank reach 2730 degrees, F.
In each tank, molten glass is four feet
eleven inches deep, and each tank con-
tains from 1300 to 1500 tons.
When a new "batch" is added to
a melting tank, the terrific heat
sometimes fuses the mingled in-
gredients into lumpy masses
which float on the surface of the
molten "metal' ' . To assure proper
melting, these lumps must be
broken up. Here, a Pennvernon
Craftsman is shown doing the
job with his thirty foot steel poker,
his face and eyes protected from
the murderous heat and glare of
the tank's interior by a wooden
shield glazed with blue glass.
The maintenance of proper tem-
peratures inside the Pennvernon
melting tanks is extremely im-
portant. This Pennvernon Crafts-
man, with his pyrometer, con-
stantly maintains a vigil that as-
sures proper melting conditions.
To take a temperature reading,
he manipulates a knob on the
box-like machine at his waist,
until the glowing platinum wire
in his telescopic spy glass merges
with the color of the molten
"metal" as seen through the
complex system of color filters
with which his glass is fitted.
Fire is the great purifier, they
say . . . but it doesn't purify the
Pennvernon "batch" enough to
meet the high Pennvernon stand-
ards. Here is a Pennvernon
Craftsman whose job it is to
watch constantly the molten glass
within the tank through his little
peep-hole door . . , and when
defects such as stones, fragments,
etc., float by f he dips them off
with his long-handled ladle.
The depth of molten glass in
Pennvernon tanks is rigorously
controlled. Every few minutes,
a Pennvernon Craftsman checks
the depth of the "metal" with his
measuring rod ... a long bar
with a right-angled, vertical bend
at the end of it which discloses,
upon examination after with-
drawal from the tank, the depth
of the molten glass within.
Direct from the surface of
the molten glass in the melt-
ing tank, up through this
most modern of drawing
machines, is the route taken
by the glowing liquid
"metal" which eventually
Window Glass. This ma-
chine, drawing the glass
vertically and keeping it
absolutely flat, from molten
"metal" to finished sheet,
is one of the chief reasons
why Pennvernon Window
Glass is of such superior
m + t .
As the molten glass is drawn up
into the drawing machine, it
gradually cools, until, by the
time the slowly moving, new-
formed sheet of glass reaches
the first pair of rolls seen in the
picture, its surfaces are cooled
and finished beyond possibility
of injury. Nothing can possibly
touch and mar the bright, smooth
surfaces of the glass during its
Here, at the top of the drawing
machine, thirty feet above the
tank of molten glass whence it
started, the finished sheet of
Pennvernon Window Glass
emerges on the cut-off floor. This
Pennvernon Craftsman is care-
fully calibrating the glass to make
sure it is of proper and uniform
'VACUUM CUPS FOR FINGERS
When Pennvernon Glass of greater thickness than
ordinary single or double strength is being drawn,
and is being cut off in larger sizes from the sheet as
it emerges from the drawing machine, the heavy
sheets are handled by machinery. The man shown
here operates an automatic apparatus that clamps
vacuum cups of rubber on the glass, lifts it aside after
it has been cut from the machine, and places it
gently, as the suction of the vacuum cups is released,
upon the trimming table.
Here this Pennvernon Crafts-
man trims off the uneven edges,
shifting the great sheet of glass,
when necessary, by means of a
foot lever which raises the sheet
on well-oiled rollers and permits
of its easy handling.
• READY TO LEAVE
Once the large sheets are trimmed, the vacuum
cups are again called into service to lift them
carefully from the trimming table and deposit
them on this suspended trolley. When the
trolley is loaded, it is rolled off the cut-off
floor into the cutting department.
Pennvernon Craftsmen like
this one, knowing from long
experience all there is to
know about cutting sheet
glass quickly and accu-
rately, take the sheets of
Pennvernon as they come
from the cut-off room and
cut them into the standard
and special sizes required
to fill the Pennvernon orders
pouring in from all over
the country. Pennvernon
is very easy to cut. A sweep
of the arm ... a gentle tap
. . . and the job is done.
As a check on the grading of the glass, Penn-
vernon is subjected at frequent regular in-
tervals to a rigid edge inspection. One edge
of the light of glass is inserted in the slot of a
mercury vapor lamp, and then this Penn-
vernon Craftsman checks it carefully, by the
violet light which illuminates the edges, for
seeds, imperfections, etc.
This machine sprays water upon sheets of
Pennvernon Window Glass, scrubs the glass
on both surfaces with soft brushes to remove
finger marks, dust, etc., and dries the glass
again ... all in one continuous operation.
'SPECIAL SHIPPING CARTONS
Pennvernon Window Glass is not only manufactured in
such a way as to insure the very highest quality possible,
but every precaution is taken in the packing and shipping
of the glass to preserve that fine quality. Here is a Penn-
vernon Craftsman preparing some of the moisture-proof,
asphalt-lined, corrugated cartons in which Pennvernon
Window Glass is placed before being further protected for
shipment by the slatted wooden Pennvernon shipping crate.
• CRATE MAKING
A complete crate manufacturing
plant is maintained in connec-
tion with each Pennvernon
Window Glass plant. Here lum-
ber is sawed into proper lengths,
the Pennvernon name and glass
size is stamped on the end mem-
bers of the future crate, and
then Pennvernon Craftsmen like
this one assemble the units , . .
and the nailing machine does
tjcjk-. *^v * * ■■■* ■» * ■ * * .*-r*w^-
Between every light of Penn-
vernon and the next is placed a
sheet of soft, absorbent, non-
scratching, protective paper, be-
fore the glass is packed in car-
tons and crates. This painstaking
care to safeguard the excellence
of Pennvernon, to protect it from
moisture and chemicals, to pre-
vent its scratching or being other-
wise harmed during shipment,
is reflected in the excellent con-
dition in which Pennvernon
Window Glass arrives at its final
destination for use.
A new method of packing safe-
guards Pennvernon Window
Glass against breakage, staining
and scratching during shipment,
insures much greater conven-
ience in unpacking and repack-
ing the glass at its destination,
and provides greater protection
for handlers against being cut
by dropped lights, etc. The glass,
with sheets of paper between
lights, is placed in an asphalt-
lined, moisture-proof carton, and
then the carton slides easily into
the specially designed light-
weight Pennvernon wood crate.
Once packed, Pennvernon Window Glass is shipped to pro-
gressive glass jobbers throughout the country, who carry a
complete stock of sizes and qualities. The glass is also distributed
to Pittsburgh Plate Glass Company warehouses in leading cities.
These jobbers and warehouses then supply Pennvernon Window
Glass in the desired sizes and qualities to the ultimate users of
this fine window glass. Thus ends the long and carefully con-
trolled journey of Pennvernon from raw materials to finished
glass in the hands of the consumer . . . and on every step of the
way, that indefinable but invaluable quality . . . Pennvernon
Craftsmanship . . . makes absolutely sure that Pennvernon
Window Glass will be a clearer, brighter, better-looking and
lilt 4 . **m
PENNVERNON WINDOW GLASS
is available through progressive glass jobbers
everywhere, and at the following warehouses
of the Pittsburgh Plate Glass Company.
101 Lincoln Street
ALBANY, N. Y.
N. Ferry St., East of Broadway
827 North 12th Street
Thirteenth and Grant Streets
172-174 Marietta Street, N. W.
8-12 S. Paca Street
912 North 20th Street
300-316 Babcock Street
BRONX, N. Y.
144th and Exterior Streets
BROOKLYN, N. Y.
Jay, Water & Plymouth Streets
BUFFALO, N. Y.
101-107 Seneca Street
840 Utah Avenue
CHARLOTTE, N. C.
214-216 East 6th Street
431-451 St. Clair Street
B'way, Court & Eggleston Aves.
3849 Hamilton Avenue
324 East Second Avenue
Santa Fe Terminal Building
414-428 Scott Street
Broadway at Market
DES MOINES, Iowa
108 East 4th Street
Hamilton & Holden Avenues
EL PASO, Texas
1100-06 Overland Street
FORT WORTH, Texas
321-323 S. Main Street
GRAND RAPIDS, Mich.
21-23 S. Ionia Avenue
1 7th and Brookwood Streets
38-40 Chapel Street
HIGH POINT, N. C.
431 Hamilton Street
Crawford & Commerce Streets
59-61 South State Avenue
1252-56 W. Beaver Street
KANSAS CITY, Mo.
5th and Wyandotte Streets
203-211 Humes Street
LITTLE ROCK, Ark.
Foot of Scott Street
16th and Main Streets
435 Madison Avenue
816-830 North Market Street
MINEOLA, N. Y.
49 Windsor Avenue
616-628 South Third Street
MT. VERNON, N. Y.
556-562 S. Fulton Avenue
Grundy St. and 11th Ave., North
NEWARK, N. J.
Elizabeth Ave. & Peddie Street
NEW HAVEN, Conn.
26 Mill Street
NEW ORLEANS, La.
OKLAHOMA CITY, Okla.
101-103 E. California Avenue
14th and Jones Streets
913-917 S. Washington Street
16th and Indiana Avenue
(N. Philadelphia Station)
632-642 Duquesne Way
14-24 Pleasant Avenue, S. E.
ROCHESTER, N. Y.
362 Exchange Street
Fitzhugh and Water Streets
SAN ANTONIO, Texas
1420-1426 S. Alamo Street
Central of Georgia Terminals
Wyoming Ave. at New Street
Fannin and Commerce Streets
SOUTH BEND, Ind.
1 138-1 140 S. Lafayette Street
40 Albany Street
ST. LOUIS, Mo.
3900 Chouteau Avenue
ST. PAUL, Minn.
459-461 Jackson Street
SYRACUSE, N. Y.
838 Erie Boulevard, West
1006-1008 Ashley Street
2410-2416 Albion Street
Detroit and Archer Streets
UTICA, N. Y.
615 Eagle Street
WASHINGTON, D. C.
4th and Channing Streets, N. E.
54 Scott Street
214-218 East Boardman Street
Copyright, 1935, Pittsburgh Plate Glass Company
PRINTED IN U.S.A. 5123 15M 4-35